EP2436047B1 - Light scattering and conversion plate for leds - Google Patents

Light scattering and conversion plate for leds Download PDF

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Publication number
EP2436047B1
EP2436047B1 EP10726270.1A EP10726270A EP2436047B1 EP 2436047 B1 EP2436047 B1 EP 2436047B1 EP 10726270 A EP10726270 A EP 10726270A EP 2436047 B1 EP2436047 B1 EP 2436047B1
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Prior art keywords
layer
systems
illumination system
thickness
made out
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German (de)
French (fr)
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EP2436047A2 (en
Inventor
Hans-Helmut Bechtel
Matthias Heidemann
Peter J. Schmidt
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Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
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Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/483—Containers
    • H01L33/486—Containers adapted for surface mounting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
    • H01L33/502—Wavelength conversion materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • H01L33/505—Wavelength conversion elements characterised by the shape, e.g. plate or foil
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
    • H01L2933/0091—Scattering means in or on the semiconductor body or semiconductor body package

Definitions

  • the present invention is directed to novel luminescent materials and compounds for light emitting devices, especially to the field of LEDs
  • DE 10 2006 061175 A1 describes illumination system comprising a LED/light scattering plate/light conversion layer structure, wherein the light scattering layer may be ceramic plate and the light conversion layer comprises a yellow emitting phosphor and may have a thickness below 200 ⁇ m.
  • WO 2006/035353 A2 describes in an example an illumination system comprising a LED/Al2O3-waver/ceramic YAG:Ce light conversion plate.
  • the thickness of the ceramic light conversion plate may be between 14 and 24 ⁇ m. It describes in the examples that by simple varying the thickness of the light conversion layer the colour temperature of the illumination systems can be varied.
  • US 2009/026908 A1 describes in the examples an illumination system comprising a LED/light conversion layer/light scattering layer structure, wherein the light conversion layer is a ceramic YAG:Ce plate having a density of 98% having a thickness 250 ⁇ m and the scattering layer is fitted within a spherical lens.
  • a and B match A ⁇ 4*B, more preferred A ⁇ 7*B.
  • layer and /or “plate” especially mean and/or include an object which extends in one dimension (i.e. the height) to ⁇ 40%, more preferred ⁇ 20% and most preferred ⁇ 10% than in any of the other dimensions (i.e. width and length).
  • scattering especially means and/or includes the change of the propagation direction of light.
  • converting especially means and/or includes the physical process of absorption of light and emitting of light in another wavelength area, e.g. due to radiative transitions that involve at least one ground state and at least one excited state and that may be described with a configurational coordinate diagram showing the potential energy curves of absorbing and emitting centers as a function of the configurational coordinate.
  • no conversion properties especially means and/or includes that ⁇ 95%, more preferred ⁇ 97%, more preferred ⁇ 98% and most preferred ⁇ 99% of all transmitted light passes the plate without being converted.
  • the primary light source will in most applications be a blue LED; however, any devices known in the field to the skilled person in the art may be used.
  • the first and second layer are essentially made out of a ceramic material.
  • the term "essentially” in the sense of the present invention especially means ⁇ 90 (wt.)-%, more preferably ⁇ 95 (wt.)-%, yet more preferably ⁇ 98 (wt.)-% and most preferred ⁇ 99 (wt.)-%.
  • ceramic material in the sense of the present invention means and/or includes especially a crystalline or polycrystalline compact material or composite material with a controlled amount of pores or which is pore free.
  • polycrystalline material in the sense of the present invention means and/or includes especially a material with a volume density larger than 90 percent of the main constituent, consisting of more than 80 percent of single crystal domains, with each domain being larger than 0.5 ⁇ m in diameter and having different crystallographic orientations.
  • the single crystal domains may be connected by amorphous or glassy material or by additional crystalline constituents.
  • the ceramic material has a volume of ⁇ 0.005 mm 3 to ⁇ 8 mm 3 , more preferred ⁇ 0.03 mm 3 to ⁇ 1 mm 3 and most preferred ⁇ 0.08 mm 3 to ⁇ 0.18 mm 3 .
  • the ceramic material has a density of ⁇ 90% and ⁇ 100% of the theoretical density. This has been shown to be advantageous for a wide range of applications within the present invention since then the luminescent properties of the at least one ceramic material may be increased.
  • the ceramic material has a density of ⁇ 97% and ⁇ 100% of the theoretical density, yet more preferred ⁇ 98% and ⁇ 100%, even more preferred ⁇ 98.5% and ⁇ 100% and most preferred ⁇ 99.0% and ⁇ 100%.
  • the surface roughness RMS (disruption of the planarity of a surface; measured as the geometric mean of the difference between highest and deepest surface features) of the surface(s) of the ceramic material is ⁇ 0.001 ⁇ m and ⁇ 1 ⁇ m.
  • the surface roughness of the surface(s) of the at least one ceramic material is ⁇ 0.005 ⁇ m and ⁇ 0.8 ⁇ m, according to an embodiment of the present invention ⁇ 0.01 ⁇ m and ⁇ 0.5 ⁇ m, according to an embodiment of the present invention ⁇ 0.02 ⁇ m and ⁇ 0.2 ⁇ m and according to an embodiment of the present invention ⁇ 0.03 ⁇ m and ⁇ 0.15 ⁇ m.
  • the specific surface area of the ceramic material is ⁇ 10 -7 m 2 /g and ⁇ 0.1 m 2 /g.
  • the thickness B of the second layer is ⁇ 5 ⁇ m and ⁇ 80 ⁇ m. This has been shown to be advantageous for many applications within the present invention since by doing so the packing efficiency and side emission of the light scattering and conversion plate may greatly be increased and reduced, respectively.
  • the thickness B of the second layer is ⁇ 10 ⁇ m and ⁇ 50 ⁇ m.
  • the thickness A of the first layer is ⁇ 50 ⁇ m and ⁇ 1000 ⁇ m. This has been shown to be advantageous, since by doing so, for many application the scattering features and the uniformity of the light emitting profile of the light scattering and conversion plate may greatly be increased.
  • the thickness A of the first layer is ⁇ 100 ⁇ m and ⁇ 300 ⁇ m.
  • the scattering coefficient of the first layer is >0 and ⁇ 1000 cm -1 .
  • the scattering coefficient of the first layer is ⁇ 100 and ⁇ 500 cm -1 .
  • the mean refractive index n of the first layer is ⁇ 1.3 and ⁇ 2.5.
  • the difference ⁇ n in refractive index between the refractive index of the first layer and the second layer is ⁇ 0.03 and ⁇ 1. This has been shown to be advantageous for mixing the light from the primary light source and the converted light from the second layer for many applications.
  • ⁇ n is ⁇ 0.3 and ⁇ 0.5.
  • the plate comprises a third layer provided in between the first and second layer and essentially made out of an adhesive material, preferably a silicone glue.
  • the method of producing a light scattering and conversion plate comprising the steps of
  • An illumination system according to the present invention may be of use in a broad variety of systems and/or applications, amongst them one or more of the following:
  • Fig. 1 shows a very schematic setup of an illumination system according to one embodiment of the present invention. Most of Fig. 1 is prior art and known to the skilled person and will therefore described only briefly. It is apparent that the illumination system of Fig. 1 is exemplarily only and the skilled person may use different parts or replace it at lib.
  • the illumination system 1 comprises a thin film chip blue LED 20 upon which a light scattering and converting plate 10 is provided; both are covered by a lens.
  • Fig. 2 shows a detailled very schematic view of the light scattering and converting plate of Fig. 1 .
  • the plate 10 comprises a first layer 12 (with a thickness A), a second layer 14 (with a thickness B) and in between a silicon glue layer 16.
  • Fig. 2 is highly schematic and in most applications the actual dimensions will be much different. It is noted that the plate 10 is provided in the illumination system 1 so that the second layer 12 is in the optical path between the blue chip LED 20 and the second layer 14.
  • a Y 2.88 Ce 0.012 Al 5 O 12 layer (i.e. the second layer 14) was ground from both sides from a 1.1 mm thick wafer after sintering to 300 ⁇ m thickness.
  • a 1 mm thick polycrystalline Al 2 O 3 layer (PCA, the first layer 12) with a mass density of 99.98 percent of the crystalline Al 2 O 3 was ground to 150 ⁇ m.
  • the first layer was coated with a Silicone layer (Shin Etsu KJR-9222A and KJR-9222A, mixing ratio 1:1), the second layer was attached and the silicone layer was hardened at a temperature of 100°C for one hour and cured at 150°C for 2 hours.
  • the second layer 14 was further ground to a thickness of 17 (Example I) and 30 ⁇ m (Example II), respectively.
  • both plates were diced to 0.99 x 0.99 mm 2 , mount on a blue TFFC LED emitting at about 450 nm and lensed. LED packaging was done in the same was as for Lumiramic phosphor converted LEDs.
  • Example I was made in analogy to the inventive Examples.
  • the second layer was set to a thickness of 120 ⁇ m and made out of Y 2.842 Gd 0.15 Ce 0.008 Al 5 O 12 (i,e. a lower Cerium-Content to match the higher thickness)
  • Fig. 3 shows a photograph of a detail of a light scattering and converting plate according to Example I of the present invention.
  • the light scattering and converting plate has an overall thickness of about 205 ⁇ m, whereby the first layer is about 140 ⁇ m thick, the second layer about 30 ⁇ m and the silicon layer about 35 ⁇ m.
  • Fig.4 shows a photograph of a detail of a light scattering and converting plate according to Example II of the present invention.
  • the light scattering and converting plate has also an overall thickness of about 205 ⁇ m; however, here the first layer is about 146 ⁇ m thick, the second layer about 17 ⁇ m and the silicon layer about 42 ⁇ m.
  • Fig. 5 shows the spatial radiation pattern of the two LEDs according to Example I and II of the present invention and a comparative example. Due to emission from the faces of the Lumiramic converter plate of the comparative example the radiative flux under large emission angle is higher compared to the flux under large angles emitted by LEDs with converter plates of Example I and Example II of the present invention.
  • Fig. 6 shows the Emission spectra of the two LEDs according to Example I and II of the present invention and the comparative example.
  • the comparative example 120 ⁇ m
  • the total conversion strength is low and the peak of the emitted blue light is much larger than the maximum of the converted light.
  • the 30 ⁇ m Example both peaks are about equal, which shows the high efficacy of the light scattering and conversion plate.
  • Fig. 7 shows a CIE 1931 Chromaticity chart showing the Planckian locus and the color points of the two LEDs according to the Example I and II of the present invention and the comparative example. It can be seen that due to the inventive scattering and light emitting plate a low color temperature of about 4000K has been realized with the 30 ⁇ m Example, whereas only a small change in size of the conversion layer 12 (i.e. to 17 ⁇ m) leads to a dramatic increase of color temperature to about 10000K. Variation of thickness and Cerium concentration gives access to white LED production of a color temperature ranging from above 10 000K to 4000K and below.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Led Device Packages (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Luminescent Compositions (AREA)
  • Electroluminescent Light Sources (AREA)
  • Laminated Bodies (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Planar Illumination Modules (AREA)

Description

    FIELD OF THE INVENTION
  • The present invention is directed to novel luminescent materials and compounds for light emitting devices, especially to the field of LEDs
    • BACKGROUND OF THE INVENTION
  • In recent years, several new techniques and setups have been developed for LEDs, amongst them the introduction of ceramic converter plates and layers. In this regard, reference is made e.g. to the US 2004 / 145 308 .
  • DE 10 2006 061175 A1 describes illumination system comprising a LED/light scattering plate/light conversion layer structure, wherein the light scattering layer may be ceramic plate and the light conversion layer comprises a yellow emitting phosphor and may have a thickness below 200 µm.
  • WO 2006/035353 A2 describes in an example an illumination system comprising a LED/Al2O3-waver/ceramic YAG:Ce light conversion plate. The thickness of the ceramic light conversion plate may be between 14 and 24 µm. It describes in the examples that by simple varying the thickness of the light conversion layer the colour temperature of the illumination systems can be varied.
  • US 2009/026908 A1 describes in the examples an illumination system comprising a LED/light conversion layer/light scattering layer structure, wherein the light conversion layer is a ceramic YAG:Ce plate having a density of 98% having a thickness 250 µm and the scattering layer is fitted within a spherical lens.
  • However, there is still the continuing need for converter plates and layers which show good emitting and scattering properties.
    • SUMMARY OF THE INVENTION
  • It is an object of the present invention to provide an illumination system which is usable within a wide range of applications and especially allows the fabrication of warm white pcLEDs with optimized luminous efficiency and color rendering.
  • This object is solved by an illumination system according to claim 1 of the present invention.
  • Preferably A and B match A≥ 4*B, more preferred A≥ 7*B.
  • The term "layer" and /or "plate" especially mean and/or include an object which extends in one dimension (i.e. the height) to ≤ 40%, more preferred ≤ 20% and most preferred ≤ 10% than in any of the other dimensions (i.e. width and length).
  • The term "scattering" especially means and/or includes the change of the propagation direction of light.
  • The term "converting" especially means and/or includes the physical process of absorption of light and emitting of light in another wavelength area, e.g. due to radiative transitions that involve at least one ground state and at least one excited state and that may be described with a configurational coordinate diagram showing the potential energy curves of absorbing and emitting centers as a function of the configurational coordinate.
  • The term "no conversion properties" especially means and/or includes that ≥95%, more preferred ≥97%, more preferred ≥98% and most preferred ≥99% of all transmitted light passes the plate without being converted.
  • Such an illumination system has shown for a wide range of applications within the present invention to have at least one of the following advantages:
    • The surprising result of one of the basic ideas underlying the present invention, i.e. separating scattering and converting is that for most application both a good forward emission together with an angular stability of the emission profile can be found.
    • The overall setup of the illumination system can be kept simple and small
    • The lifetime of the illumination system is considerably extended because of improved heat dissipation properties and improved chemical stability
    • additional functional layers can be applied on one layer only eliminating the risk of damaging the more expensive other layer.
  • The primary light source will in most applications be a blue LED; however, any devices known in the field to the skilled person in the art may be used.
  • According to a preferred embodiment, the first and second layer are essentially made out of a ceramic material.
  • The term "essentially" in the sense of the present invention especially means ≥90 (wt.)-%, more preferably ≥95 (wt.)-%, yet more preferably ≥98 (wt.)-% and most preferred ≥99 (wt.)-%.
  • The term "ceramic material" in the sense of the present invention means and/or includes especially a crystalline or polycrystalline compact material or composite material with a controlled amount of pores or which is pore free.
  • The term "polycrystalline material" in the sense of the present invention means and/or includes especially a material with a volume density larger than 90 percent of the main constituent, consisting of more than 80 percent of single crystal domains, with each domain being larger than 0.5 µm in diameter and having different crystallographic orientations. The single crystal domains may be connected by amorphous or glassy material or by additional crystalline constituents.
  • According to a preferred embodiment, the ceramic material has a volume of ≥ 0.005 mm3 to ≤ 8 mm3, more preferred ≥ 0.03 mm3 to ≤ 1 mm3 and most preferred ≥ 0.08 mm3 to ≤ 0.18 mm3.
  • The ceramic material has a density of ≥90% and ≤ 100% of the theoretical density. This has been shown to be advantageous for a wide range of applications within the present invention since then the luminescent properties of the at least one ceramic material may be increased.
  • More preferably the ceramic material has a density of ≥97% and ≤ 100% of the theoretical density, yet more preferred ≥98% and ≤ 100%, even more preferred ≥98.5% and ≤ 100% and most preferred ≥99.0% and ≤ 100%.
  • According to a preferred embodiment of the present invention, the surface roughness RMS (disruption of the planarity of a surface; measured as the geometric mean of the difference between highest and deepest surface features) of the surface(s) of the ceramic material is ≥ 0.001 µm and ≤1 µm.
  • According to an embodiment of the present invention, the surface roughness of the surface(s) of the at least one ceramic material is ≥0.005 µm and ≤0.8 µm, according to an embodiment of the present invention ≥0.01 µm and ≤0.5 µm, according to an embodiment of the present invention ≥0.02 µm and ≤0.2 µm and according to an embodiment of the present invention ≥0.03 µm and ≤ 0.15 µm.
  • According to a preferred embodiment of the present invention, the specific surface area of the ceramic material is ≥10-7 m2/g and ≤ 0.1 m2/g.
  • The thickness B of the second layer is ≥5 µm and ≤80 µm. This has been shown to be advantageous for many applications within the present invention since by doing so the packing efficiency and side emission of the light scattering and conversion plate may greatly be increased and reduced, respectively.
  • Preferably the thickness B of the second layer is ≥10 µm and ≤50 µm.
  • The thickness A of the first layer is ≥50 µm and ≤1000 µm. This has been shown to be advantageous, since by doing so, for many application the scattering features and the uniformity of the light emitting profile of the light scattering and conversion plate may greatly be increased.
  • Preferably the thickness A of the first layer is ≥100 µm and ≤300 µm.
  • According to a preferred embodiment, the scattering coefficient of the first layer is >0 and ≤1000 cm-1.
  • The scattering coefficient s is determined by measurement of the reflectance R0 and/or the transmittance To of a thin layer with thickness A according to the equations: sA = 1 b ⁢ Arctgh ⁢ 1 - k ⁢ R 0 b ⁢ R 0
    Figure imgb0001
     sA = 1 b ⁢ Arsinh ⁢ b T 0 - Arsinh b
    Figure imgb0002
  • With b = k 2 - 1
    Figure imgb0003
     and k = s + a s
    Figure imgb0004
     (a is the absorption coefficient of the layer)
  • In case of a=0 equations simplify to sA = R 0 1 - R 0
    Figure imgb0005
     sA = 1 - T 0 T 0
    Figure imgb0006
  • Preferably the scattering coefficient of the first layer is ≥100 and ≤500 cm-1.
  • According to a preferred embodiment, the mean refractive index n of the first layer is ≥1.3 and ≤2.5.
  • According to a preferred embodiment, the difference Δn in refractive index between the refractive index of the first layer and the second layer is ≥0.03 and ≤1. This has been shown to be advantageous for mixing the light from the primary light source and the converted light from the second layer for many applications. Preferably Δn is ≥0.3 and ≤0.5.
  • According to a preferred embodiment, the plate comprises a third layer provided in between the first and second layer and essentially made out of an adhesive material, preferably a silicone glue.
  • The method of producing a light scattering and conversion plate comprising the steps of
    1. a) Providing a first and second layer, whereby the thickness of the second layer is larger than desired
    2. b) Connecting the first and second layer, optionally by use of a third layer provided in between the first and second layer and essentially made out of an adhesive material
    3. c) Mechanically reducing the thickness of the second layer, e.g. by grinding
  • By doing so, it has been shown for many applications that a light scattering and conversion plate according to the present invention can be made easily and effectfully even for small thicknesses of the second layer.
  • An illumination system according to the present invention may be of use in a broad variety of systems and/or applications, amongst them one or more of the following:
    • Office lighting systems
    • household application systems
    • shop lighting systems,
    • home lighting systems,
    • accent lighting systems,
    • spot lighting systems,
    • theater lighting systems,
    • fiber-optics application systems,
    • projection systems,
    • self-lit display systems,
    • pixelated display systems,
    • segmented display systems,
    • warning sign systems,
    • medical lighting application systems,
    • indicator sign systems, and
    • decorative lighting systems
    • portable systems
    • automotive applications
    • green house lighting systems
  • The aforementioned components, as well as the claimed components and the components to be used in accordance with the invention in the described embodiments, are not subject to any special exceptions with respect to their size, shape, material selection and technical concept such that the selection criteria known in the pertinent field can be applied without limitations.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Additional details, features, characteristics and advantages of the object of the invention are disclosed in the subclaims, the figures and the following description of the respective figures and examples, which --in an exemplary fashion-- show several embodiments and examples of a luminescent material for use in an illumination system according to the invention as well as several embodiments and examples of an illumination system according to the invention.
    • Fig. 1 shows a very schematic setup of an illumination system according to one embodiment of the present invention.
    • Fig. 2 shows a detailled very schematic view of the light scattering and converting plate of Fig. 1
    • Fig. 3 shows a photograph of a detail of a light scattering and converting plate according to Example I of the present invention.
    • Fig.4 shows a photograph of a detail of a light scattering and converting plate according to Example II of the present invention.
    • Fig. 5 shows the spatial radiation pattern of two LEDs according to Example I and II of the present invention and a comparative example
    • Fig. 6 shows the Emission spectra of the two LEDs according to Example I and II of the present invention and the comparative example; and
    • Fig. 7 shows a CIE 1931 Chromaticity chart showing the Planckian locus of the two LEDs according to Example I and II of the present invention and the comparative example
  • Fig. 1 shows a very schematic setup of an illumination system according to one embodiment of the present invention. Most of Fig. 1 is prior art and known to the skilled person and will therefore described only briefly. It is apparent that the illumination system of Fig. 1 is exemplarily only and the skilled person may use different parts or replace it at lib.
  • The illumination system 1 comprises a thin film chip blue LED 20 upon which a light scattering and converting plate 10 is provided; both are covered by a lens.
  • Fig. 2 shows a detailled very schematic view of the light scattering and converting plate of Fig. 1. The plate 10 comprises a first layer 12 (with a thickness A), a second layer 14 (with a thickness B) and in between a silicon glue layer 16. Fig. 2 is highly schematic and in most applications the actual dimensions will be much different. It is noted that the plate 10 is provided in the illumination system 1 so that the second layer 12 is in the optical path between the blue chip LED 20 and the second layer 14.
  • The invention will be further understood by the following Examples I and II which - in a merely illustrative fashion - shows several illumination systems of the present invention.
  • In the examples a Y2.88Ce0.012Al5O12 layer (i.e. the second layer 14) was ground from both sides from a 1.1 mm thick wafer after sintering to 300 µm thickness. Also a 1 mm thick polycrystalline Al2O3 layer (PCA, the first layer 12) with a mass density of 99.98 percent of the crystalline Al2O3 was ground to 150 µm. Then the first layer was coated with a Silicone layer (Shin Etsu KJR-9222A and KJR-9222A, mixing ratio 1:1), the second layer was attached and the silicone layer was hardened at a temperature of 100°C for one hour and cured at 150°C for 2 hours.
  • After the gluing, the second layer 14 was further ground to a thickness of 17 (Example I) and 30 µm (Example II), respectively.
  • Then both plates were diced to 0.99 x 0.99 mm2, mount on a blue TFFC LED emitting at about 450 nm and lensed. LED packaging was done in the same was as for Lumiramic phosphor converted LEDs.
  • Furthermore a comparative Example I was made in analogy to the inventive Examples. In this comparative example, the second layer was set to a thickness of 120 µm and made out of Y2.842Gd0.15Ce0.008Al5O12 (i,e. a lower Cerium-Content to match the higher thickness)
  • Fig. 3 shows a photograph of a detail of a light scattering and converting plate according to Example I of the present invention. The light scattering and converting plate has an overall thickness of about 205 µm, whereby the first layer is about 140 µm thick, the second layer about 30 µm and the silicon layer about 35 µm.
  • Fig.4 shows a photograph of a detail of a light scattering and converting plate according to Example II of the present invention. By chance, the light scattering and converting plate has also an overall thickness of about 205 µm; however, here the first layer is about 146 µm thick, the second layer about 17 µm and the silicon layer about 42 µm.
  • Fig. 5 shows the spatial radiation pattern of the two LEDs according to Example I and II of the present invention and a comparative example. Due to emission from the faces of the Lumiramic converter plate of the comparative example the radiative flux under large emission angle is higher compared to the flux under large angles emitted by LEDs with converter plates of Example I and Example II of the present invention.
  • Fig. 6 shows the Emission spectra of the two LEDs according to Example I and II of the present invention and the comparative example. For the comparative example (120µm) the total conversion strength is low and the peak of the emitted blue light is much larger than the maximum of the converted light. For the 30µm Example both peaks are about equal, which shows the high efficacy of the light scattering and conversion plate.
  • Fig. 7 shows a CIE 1931 Chromaticity chart showing the Planckian locus and the color points of the two LEDs according to the Example I and II of the present invention and the comparative example. It can be seen that due to the inventive scattering and light emitting plate a low color temperature of about 4000K has been realized with the 30µm Example, whereas only a small change in size of the conversion layer 12 (i.e. to 17µm) leads to a dramatic increase of color temperature to about 10000K. Variation of thickness and Cerium concentration gives access to white LED production of a color temperature ranging from above 10 000K to 4000K and below.

Claims (7)

  1. Illumination system, comprising a primary light source and at least one light scattering and conversion plate (10) comprising:
    a first layer (12) having scattering properties and essentially no conversion properties, wherein the first layer is essentially made out of a material selected from the group comprising glass, Al2O3, Y3Al5O12, RE3Al5O12 (RE= rare earth metal), Y2O3, ZnS, AlON, AlPON, AlN, MgAl2O4, SiC, SiO2, Si3N4 or mixtures thereof, and
    a second layer (14) having conversion properties and being located in the optical path in between the primary light source and the first layer, wherein the second layer is essentially made out of a material selected from the group comprising LubYcGddCeeAl5O12 with b+c+d+e =3, 0.09 ≤ e ≤ 0.24, Ca1-x-y-z-0.5uMxSi1+u-v-zAl1-u+v+zN3-vOv:Euy,Cez with 0 ≤ u < 0.2, 0 < v < 0.05, 0 ≤ x < 1, 0.001≤ y ≤ 0.01, 0.002 ≤ y ≤ 0.04, and M = Sr, Ba, Mg or mixtures thereof.
    whereby the thickness A of the first layer and the thickness B of the second layer match A ≥ 3*B
    and whereby the first layer is essentially made out of a ceramic material with a density of ≥90% and ≤ 100% of the theoretical density,
    the thickness B of the second layer is ≥5 µm and ≤80 µm and
    the thickness A of the first layer is ≥50 µm and ≤1000 µm
  2. Illumination system according to claim 1 whereby the second layer is essentially made out of a ceramic material.
  3. Illumination system according to any of the claims 1 to 2, whereby the scattering coefficient of the first layer A is >0 and ≤1000 cm-1.
  4. Illumination system according to any of the claims 1 to 3 whereby the difference Δn in refractive index between the refractive index of the first layer and the second layer is ≥0.03 and ≤1
  5. The illumination system of any of the claims 1 to 4 whereby the plate comprises a third layer provided in between the first and second layer and essentially made out of an adhesive material.
  6. The illumination system according to claim 5, wherein the adhesive material comprises a silicone glue.
  7. A system comprising a illumination system according to any of the claims 1 to 6, the system being used in one or more of the following applications:
    - office lighting systems
    - household application systems
    - shop lighting systems,
    - home lighting systems,
    - accent lighting systems,
    - spot lighting systems,
    - theater lighting systems,
    - fiber-optics application systems,
    - projection systems,
    - self-lit display systems,
    - pixelated display systems,
    - segmented display systems,
    - warning sign systems,
    - medical lighting application systems,
    - indicator sign systems, and
    - decorative lighting systems
    - portable systems
    - automotive applications
EP10726270.1A 2009-05-19 2010-05-17 Light scattering and conversion plate for leds Active EP2436047B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10726270.1A EP2436047B1 (en) 2009-05-19 2010-05-17 Light scattering and conversion plate for leds

Applications Claiming Priority (3)

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EP09160613 2009-05-19
PCT/IB2010/052167 WO2010134011A2 (en) 2009-05-19 2010-05-17 Light scattering and conversion plate for leds
EP10726270.1A EP2436047B1 (en) 2009-05-19 2010-05-17 Light scattering and conversion plate for leds

Publications (2)

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EP2436047A2 EP2436047A2 (en) 2012-04-04
EP2436047B1 true EP2436047B1 (en) 2013-10-09

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EP (1) EP2436047B1 (en)
JP (1) JP2012527763A (en)
KR (1) KR101747688B1 (en)
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US9966512B2 (en) 2018-05-08
RU2011151606A (en) 2013-06-27
CN102428583B (en) 2015-06-03
US9482411B2 (en) 2016-11-01
US20170047491A1 (en) 2017-02-16
BRPI1007686B1 (en) 2019-11-05
US20140204593A1 (en) 2014-07-24
KR101747688B1 (en) 2017-06-16
CN102428583A (en) 2012-04-25
US20120069546A1 (en) 2012-03-22
WO2010134011A3 (en) 2011-01-13
KR20120030425A (en) 2012-03-28
WO2010134011A2 (en) 2010-11-25
EP2436047A2 (en) 2012-04-04
US8721098B2 (en) 2014-05-13
RU2531848C2 (en) 2014-10-27
BRPI1007686A2 (en) 2016-12-27
JP2012527763A (en) 2012-11-08

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